—Who did you stay with yesterday? I couldn’t find you anywhere.— ___________.
The room was so quiet that she could hear the _____ of her heart.
The new safety regulations were agreed on after _____ with the work-force.
His test results are not very _____. He does well one week and badly the next.
Scientists think they have _____ in their attempt to find the causes of some major dieases.
If you ever have the _____ to go abroad to work, you should take it.